--- In Don Tucker <> wrote:
>
> Could it be possible that the boards are locking up at boot, before the
> watchdog timer is initialized?
Hi Don. My immediate reaction was that this was plainly a silly response,
since they have been running for weeks before locking up. But thinking about,
it's a perfectly reasonable suggestion. Maybe there is a brownout/power blip
and on the way back up it blips or locks up?
Almost impossible to test, but thanks for the idea and I'll give it some
serious thought.
>
> On 10/23/2011 9:25 AM, naturalwatt wrote:
> >
> > Hi.
> >
> > We have several dozen TS7250, and several hundred TS7550 deployed
> > around the UK. Despite the presence on both boards of watchdog timers,
> > some units sometimes lock up and have to be power cycled. This is
> > pretty rare, and not reproducible in the workshop, but a real nuisance
> > none the less. Most boards run for years, others lock up every few weeks.
> >
> > Do others have the same experience? Is it likely to be due to noise on
> > the mains? Why doesn't the watchdog operate as it should? Is a cheap
> > surge-suppression filter socket likely to help?
> >
> > Should I implement my own watchdog using a PIC and a spare DIO line?
> > Is this likely to be more reliable than the onboard watchdog?
> >
> > Los of questions!
> >
> > Martin
> >
> >
>
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